Xavier de Gaye added the comment:
For the reson why read() must still check for EWOULDBLOCK even though
after select() has reported a file descriptor ready for reading, see
the BUGS section of select linux man page, which says:
Under Linux, select() may report a socket file descriptor as
"ready for reading", while nevertheless a subsequent read
blocks. This could for example happen when data has arrived
but upon examination has wrong checksum and is discarded.
There may be other circumstances in which a file descriptor is
spuriously reported as ready. Thus it may be safer to use
O_NONBLOCK on sockets that should not block.
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nosy: +xdegaye
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<http://bugs.python.org/issue16133>
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